Alarm Valves And Dry Pipe Valves Flashcards
What are the primary functions of Alarm Valves
-Act as check valves
-Initiate alarm signal
-Provides gauge port and signal switch ports
-Provides means of draining system
Will a paddle flow switch operate a WMG?
-No
What can the electrical signal from an alarm switch operate?
-Fans/exhaust
-Close doors
-Electric bell and buzzers, horns, and strobes
An audible alarm must be heard within how long of activating and alarm device?
5 minutes.
What is the monitor for the sprinkler system monitoring?
-Common Trouble
-Supervisory
-Alarm
Piping between the sprinkler system and the pressure actuated alarm initiating device shall be …
-Galvanized or non-corrosive
-not less than 3/8”
What is the minimum size drain for the alarm line piping’s restricted orifice to drain into?
1/4”
What types of sprinkler systems can a paddle flow switch be installed on?
Wet systems
What does the PS 10 switch typically monitor?
The Alarm line.
What does the PS 120 switch typically monitor?
System water pressure.
What does the PS 40 switch typically monitor?
System air pressure.
What are the three wet alarm valve seat types?
-Split or Groove Seat
-Pilot Port
-Divided Ring
Piping for WMG must be…
Minimum 3/4” and non-corrosive.
What is the max vertical distance a WMG can be from an alarm valve?
20’
What is the max horizontal distance a WMG can be from an alarm valve?
75’
If multiple alarm valves are piped to a single WMG, what must be installed on each feed line?
A check valve
Where is the excess pressure pump’s relief valve installed?
Directly connected to the discharge piping of the EPP.
Where does the retard chamber vent its air through?
Through the WMG or a vent on the discharge side.
True or False.
Every wet pipe system must be protected by a listed relief valve?
True
What is the minim size of a relief valve protecting a wet pipe system?
1/2”
At what pressure is the relief valve on a wet pipe system set to operate?
175psi or 10psi greater than working pressure of the system, which ever is greater.
What are the types of Dry Pipe Valves?
-Differential
-Latching Differential
-Mechanical
-Low Pressure Differential
How much water must be trapped for a drum drip to be installed?
5 Gallons
Systems with manual air maintenance must have…
A relief valve.
What are the components of an air maintenance device in order?
-Quick fill valve
-N.O. Air supply control valve
-Strainer
-Union
-Regulator
-Check Valve
-Restricted orifice
